Unable to run Blender 2.8 beta on Raspbian Buster
Blender 2.80 requires at least OpenGL 3.3 to run its UI. I don't think Raspberry Pi 4 supports that. It says:


  OpenGL ES 3.0 graphics


at https://www.raspberrypi.org/products/raspberry-pi-4-model-b/specifications/

That does not look like OpenGL 3.3 to me. 

As for 2.79, maybe you are not trying the correct build suitable for ARM processors. See this answer.